Table 1

The (logarithmic) decibel scale

Decibels Human equivalent Intensity ratios
0 dBThe auditory threshold for the average human ear at 1000 Hz1
30 dBA soft whisper1000
50 dBQuiet conversation100 000
70 dBNormal conversation10 000 000
100 dBShouting at close range10 000 000 000
140 dBA loud rock band100 000 000 000 000